But the measure will face competition at the polls. Ohio legislators also approved their own ballot measure on Tuesday to undermine the pot plan, which lawmakers worried would amount to a “marijuana monopoly” because of its provision that only 10 growers would control the wholesale pot market. The lawmakers’ measure would block other measures that benefit select economic interest groups.

The marijuana ballot measure campaign, dubbed Responsible Ohio, is just one of many ballot measures in recent history that are designed to benefit their backers. The companies funding the Responsible Ohio campaign would control — and likely profit from — the marijuana growth sites should the measure pass.

As detailed by the Center for Public Integrity, the campaign’s director, Democratic activist Ian James, came up with the idea and is planning to pay his own firm $5.6 million to push the ballot initiative.

Ohio Rep. Mike Curtin, a Democrat, said he sponsored the anti-monopoly measure because he opposes the way Responsible Ohio is using the citizen-initiated constitutional amendment, not because he opposes pot legalization.

“Are we going to allow a small group of investors, who have literally no background in drug policy… to carve themselves a special niche in our state’s founding document?” he said. “To me it’s galling. It’s nauseating.”

But James said voters should have the right to decide the issue.

“Some statehouse politicians believe the voters are smart enough to elect them, but they aren’t smart enough to decide ballot issues like marijuana legalization,” he said in an earlier statement.

James’ group still has to wait for the Secretary of State to determine if enough of its signatures are valid to make the ballot, which could take several weeks. It submitted 695,273 signatures to the state, far more than the 305,591 registered voters it needs to qualify.

If voters approve both of the conflicting measures, Ohio law says whichever gets the most votes would win.

But Secretary of State Jon Husted, a Republican, recently said that if both passed, the legislatively referred anti-monopoly measure would block Responsible Ohio’s plan because citizen-initiated measures take 30 days to go into effect.

The issue could end up before a judge.

If both pass, “we have a very interesting court fight on our hands,” Curtin said.

This story is from The Center for Public Integrity, a nonprofit, nonpartisan investigative media organization in Washington, D.C. Read more of its investigations on the influence of money in politics or follow it on Twitter.